" relative star brightnesses in the near IR are not necessarily the same as
in visible! Depends on the star's spectral class."
Betelguese, in Orion, is one example which is a super red giant about to go
supernova.
Ken
On Sat, Apr 1, 2023 at 8:41 PM Henry Spencer <hspencer@xxxxxxxxxxxxx> wrote:
On Sun, 2 Apr 2023, Troy Prideaux wrote:
Or you could maybe cheat by using a hi-res video cam with the IR+UV
filter replaced with a 1um bandpass or longpass. That should make the
sky black provided it's clear.
Note, though, that you might need a somewhat-different star catalog --
relative star brightnesses in the near IR are not necessarily the same as
in visible! Depends on the star's spectral class.
Henry